Grinding mill



July 28, 1925. 1,547,370

B. M. ELY

GRINDING MILL Original Fileu Feb. 13. 1917 3 Sheets-Sheet 1 July 28, 1925.

B. M. ELY

GRINDING MILL 3 Sheets-Sheet 2 O H e M Original Filed Feb. 13;, 1917 July 28, 1925. 1,547,370 8. M. ELY

GRINDING MILL Original Filed Feb. 13, 1917 3 Sheets-Sheet 3 Patented July 2a, 1925.

' UNITED STATES PATENT OFFICE.

. BERNARD ELY, OF OAKLEY, CINCINNATI, OHIO, ASSIGNOR, BY HESNE ASSIGN MENTS, TO INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORPORATION or NEW YORK.

GRINDING MILL.

Application filed February'18, 1817, Serial No. 148,330. Renewed Illarch 18, 1924.

To all it may concern:

Be it known that I, BERNARD M. ELY, a

citizen of the United States, residing at Oakley, Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Grinding Mills, of which the following is a Specification.

This invention relatesto improvements in mills for grinding grain, and especially to those for grinding coffee berries. In mechanism hitherto proposed for inding grain, including coffee grinders, a p urality of sets of crushing elements, for breaking and grinding the grain respectivel have been provided, and these sets of e ements have had connection with each other, so that the grain to be crushed is fed first to onevof saidj sets of elements, where it is broken orv coarsely ground and then passes tothe other.

set of elements where 'it is more finely ground. In these mechanisms it also has been proposed to remove the chaff, dust and dirt from the grain intermediate the two crushing operations, by subjecting the grain to the action of an air current of such strength that it'will carry ofl' the chaff and lighter particles and allow the heavier parti-, cles to 'pass to the second set of crushing elements. 1

One of the important objects of'this invention is to improve mechanism of the kind hereinbeforestated by so combining and correlating the parts as to; have important advantages not inherent in the prior devices while preserving any valuable feature which is present thereln.

' Another important object of the invention is to .provide an improved correlation of parts whereby a current of air of less strength than otherwise would be required will be adequate to elfect a withdrawal of the impurities from the. grain.

Another important purpose, of. the invention is to provide a grinding mechanism wherein the grain may be subjected to the action of a set of crushing elements and conveyed thence to and be acted upon by asecond set of crushing elements, or may be acted upon by the second set only, at will,

This object is secured by providing separate feeders, so correlated with the sets of crushing elements respectively that the grain supplied from one feeder will be subjected to the action of both sets of crushing elements,

while the grain supplied from the other feeder will be subjected to the action of the second set of crushing elements only.

A fourth important purpose of the invention is to provide a mill in which at the will of the operator the grain may (1) be preliminarily coarsely crushed or broken by a set of crushers or breakers, the impurities se arated therefrom and the cleaned or puri ed grain more finely crushed by a second set of crushers, or (2) may be ground-only. This object is secured by prov1ding a first and a I .second set of crushers producing difl'erent degrees of fineness of grind, a conveyer for transferring the grain from one to the other, a separating means operable upon the grain in its passage from the first set to the second, and separate feeders of unground grain respectively connected with the sets of crushers.

A further important purpose of the invention is to provide a grindingmill having a conveyer and crushing elements, with means whereby the ill efiects accruing from the conveying of the grain to the crushing elements ata faster rate than the crushing elements will accommodate are automatically overcome. This purpose is secured by providing a chamber so correlated with the conveyer and crushing elements fed by the latter that it will accommodate grain fed in excess of -.the capacity of the crushing element and will automatically return the grain when the crushing elements are capable of '7 taking care of the same. j

Another important purpose of the invention is to provide a mill havin means of most practical, simple and bene cial nature for attaining all of the aforesaid objects.

In the accompanying drawings, I have illustrated the preferred embodiment of the inventionwhen applied to the cleanin and grin-dinner coffee, but I would have 1t understood that this embodiment is merely exemplary and that changes in the details may line 2F-2 of Fig. 1, looking in the direction of arrow al;

lonIged opening therein.

he frame or casing of the present mill is suitably formed to provide the first crusher chamber A, a second crusher chamber B, a conduit C leading from the first crusher chamber, a passagewa D leading from the conduit to the secon crusher chamber, a chamber E opposite the second crusher chamber B, and a space F below the passageway D and between the chamber B and E. The passageway D is in open communication at one end with the conduit G and at the other end with the chamber B, the latter communication being preferably provided through a downwardly extending spout 20 from the passageway entering a funnel-shaped inlet 21 at the upper end of the chamber B.

In the space F there is mounted a motor, Whose casing indicated at G, has a base G which in practice preferably constitutes the base of the mill casing. This motor is preferably of an electrical nature. It is directly connected to a shaft H, one end of which is directly connected to and drives a fan I, and the other end of which is directly connected to and drives the runner burr 22 forming one of the crushing elements in the chamber B.

In this particular exemplification of the invention, the crushing elements in the chamher A are of a nature such as to break the grainthat is to say, they are, in the present exemplification and preferably, composed of a rotative breaker drum 25, which cooperates with a suitable companion element 26 which is located at one side of the axis of the drum and is preferably roughened. It will be noted that this element substantially forms one wall of the chamber and is eccentric to the axis of the drum. The crushing elements in the chamber B may be of any suitable construction. They are here shown as being of a grinding nature, .comprising the hereinbefore mentioned runner burr 22 and a stationary burr 23 having serrated or roughened confronting faces. These grinders in practice should include appropriate means whereby the motion of the runner burr is automatically stopped when a hard foreign substance gets between the burrs. A desirable construction of grinding mechanism for the chamber B is shown and described in my copending application, filed July 14, 1915, Serial No. 39,820, to which reference may be had for a further understanding relative thereto.

J designates a movable conveyer for transmitting grain which has been partially veyer is preferably of the worm type, as

here shown. The shaft H is connected by any suitable means,as a train of gears 27,

28 and 29, for examplewith the shafts 3O and 31 of the conveyer J and breaker drum 7 25, respectively.

K designates a feeding chamber which is' suitably connected to the crusher chamber A and supplies the grain to the latter. This feeder may be of any suitable nature, but preferably is formed with converging sides 32 and 33 extending from the top to the bottom thereof and opening at the lower reduced end of the feeder into the chamber A, at a place which is eccentric to the axis of the drum 25.

L designates an air conduit which extends from the fan chamber E to the conduit C. This conduit C has an opening 34 in one of its walls, through which it has communication with the conduit L, and the conduit L preferably has adjacent the said opening a laterally expanded head 35 with an opening 36 throughout its length, the opening 34 in the conduit C in such case being long, as shown best in Fig. 3. In other words, it is preferred to form the opening 34 substantially entirely across one wall of the conduit Cl and to provide the conduit L with a laterally expanded end having an opening co-extensive in length with the opening 34. A downwardly inclined spout 37 is preferably provided within the conduit C. This spout extends from the opening 34 and forms a baflle in the path of the crushed grain, falling from the chamber. The grain falls thence upon another baflie 38. The latter is disposed between the end of the spout and an air opening 39 formed in a wall of the conduit. The baffle 38 is ar ranged to discharge upon another baffle, 40, which extends to the chamber D and is inclined in a direction opposite to that of the baffle 38. An additional air opening, 41, is preferably provided in the wall of the conduit C below the s out 3'1 and in the space separating the ba es 38 and 40. The air openings 39 and 41 are preferably independently regulated by valves 42 and 43 of suitable kind.

Thus it will be seen that when the fan I is in motion it will create a current of air which will pass from the opening 39 around the discharge end of the baffle 38 and thence upward and into the spout 37 and to the opening 34, through which opening it will flow to the fan casing E, through the conduit L. This current of air carries with it the chaff, dust and dirt-that is, the impuritieswhich have been freed from the grain by the set of breaking elements 25 and 26, and the air, together with the impurities therein, is discharged into the fan chamber E, and finally from the latter through an outlet 44' preferably into a suitable container, not shown. It will be underbetween the discharge end of the bafile 38 and the baflle 40 is such that the air passes through this thin sheet of falling grain in a direction which is at an angleto the direction of movement of the grain instead of in a direction which is parallel tothe.

movement of the grain. The baflies thus direct the air currents in particular defined paths through the falling grains, so that the separation of the impurities from the grain Vis'efl'ectively accomplished by a current of air of less strength than. otherwise would.

i be required, and there is less danger of the current of air carrying ofi grain as well as impurities: and, moreover, the impact to which the grain is subjected in fallingfrom one baflie to another loosens an chaff etc. which may be adhering to the arger particles of the grain, whereby the withdrawal of the chafl etc. is' facilitated. Again, it'will be noted that the provision of two separate and, independently regulatable air inlet openings affords PIOViSlOIl for the subject-.

ing of the broken grain to the action of eitherone or both of two separate currents of air of independently regulatable strengths at different places in the travel of the grain. When the inlets are arranged in the particular relation to the baflies and outlet spout shown in the accompanying drawings, the grain in its'travel upon/the bafile 38 and between the upper wall of the spout and said baflie, is subjected to a current of air which removes the impurities-which are upon the surface thereof and in 'its travel between the baffle 38 and the baffle 40 is subjected to another current of air which removes the remaining impurities; w

Obviously, the graifj which has been thus broken and separated "from its impurities is delivered to the cohveyer J and is conduct-' ed by said eosiyeyer'and discharged into the second chamberjBfwherein it is subjected-to the action of the second set of crushing elementsname'ly, the runner burr 22 and the stationary burr 23. These burrs are relatively adjustable to grind to various degrees of fineness, as usual. The purified and ground grain is discharged from the chamber B, in the hereinexemplified form of the invention, through an outlet 45' and into a suitable container, not shown.

'An important art of the present invention consists as a ready implied, in the provision of means whereby the grain may be ground in the chamber B without being preliminarily crushed in'the chamber A or purified in the conduit C. To this end, the

passageway D has communication with a second feeder chamber, marked M. This Second feeder chamber 0 ens at its lower end into the portion of t e assageway D situated after that portion 0 the passageway which opens into the conduit C. Hence, it will be noted that grain may be su plied through the feeder chamber M an will reach the crusher chamber B without first passing throu h the chamber A or the confeeder chamber M is disposed immediately above and is in open communication wit one end of the passageway D. Hence, this chamber M not only serves as a feeder for grain, which is not to besubjected to the action of the first 'set of crushing elements and to the purifying action of the air current, but also serves, when the grain is be-. ing fed from the feeder K, and hence is being subjected to action of the first set of crushing elements and to the purifying action of the air currents, as an upper enlargement of the discharge end of the passageway D into which any grain fed in excess of the" capacityof the crushing elements inthe chamber B is automatically forced and flows V gravitally back into said passagewa to be delivered thence to the chamber B, w en the quantity fed is 'below the capacity of the crushing elements. in the latter. In other words, it serves at times as a feeder for gram which is not to be subjected to the action of by overcomes the ill effects which would follow congestion or clogging of grain in the discharge end of the latter, or in the chamber B.

It is apparent that when the grinding elements in the chamber B are relatively adjusted to pulverize the grain they will .not take care of the grain as rapidly as when they merely granulate the same and hence in a machine lntended to either granulate or to pulverize at will, it is desirable to regulate the feed of the grain to the breaker elements in the chamber A to thereby overcome any possibility of the broken grain overflowing the chamber M. To this end, a valve of any suitable nature which Wlll r late the sup; ly of grain to the chamber A is employed. One such valvethe sam'e being the communication of the feeder chamber K with the chamber A, as is apparent. The inlet 21 to the chamber B similarly is 'provided with a suitable valve, as the one shown at 46, which is adjustable to close said inlet completely, or to open it either fully or partially as required. The valve 46 whiclr I prefer is a slidably mounted plate having an opening 46.

The operation and advantages of the structure will be apparent from the foregoing description, and it will be understood that the form herein illustrated is merely exemplary and that changes may be made in the number or character ofsets of crushing elements and in other details without departing from the spirit of the invention or the scope of the subjoined claims. While I have herein referred to a first set of crushing elements and a second set of crushing elements, each having a feeding chamber separate from the other, it of course will be understood that it is quite within the, spirit of the invention to provide any suitable number of steps in such crushin elements and to provide all or certain of the same only, with their separate feed ng chambers. Hence, the terms, first crusher chamber or set of first crushing elements, or second crusher chamber or set of second crushing elements are intended to be construed broadly, being merely employed as a convenient way to distinguish one of said chambers and its crushing devices from another.

I have before referred to the ill effects which occur from the feeding of grain to the chamber B faster than the set of crushing elements of the latter is capable of grinding the same or at a time or in quantity which would result in the clogging of the. action of the second set of crushing elements. It will be'understood that there may be several causes in the operation of the mill which render it advisable to tempo rarily dischar e a part or all of the grain into the over ow chamber formed by the feeder M, and among these there may be mentioned a failure of the grinding elements in the chamber B to operate for a short period or a choking of said grinding elements due to foreign substances. In any of these events, the coffee passing to the grind ing elements would be forced upward into the feeder M. These causes, and any other cause which makes it advisable temporarily to supply grain to the overflow chamber are all intendedto be included in the expression to the effect that said chamber receives grain which is fed faster than the capacity of the grinding elements.

Having thus described the invention what cleaning means and conducting it to the a feeder of the secondary crushing means.

' 2. A grinding mill having consecutively operable primary and secondary crushing means, an independent gravitally acting feeder in direct communication with each of said crushing means, means for conveying the product of the primary crushing means to the feeder of the secondary crushing means, and means for suctionally cleaning the product in transit between the primary crushing means and said conveying means.

3. Ina grain grinding mill, the combination of a breaking means, and a grinding means, each of a nature to initially act upon the berries or like grain in loose condition and one being of a nature to act successively to the other, means subjecting the broken grain intermediate the breaking means and grinding means to a current of air for the removal of the impurities therefrom, means for conveying the broken and purified grain from the breaking means to the grinding means, means through which grain to be broken, purified and ground is fed to the breaking means, and a separate means through which grain may be fed to the grinding means without passing through the breaking means and outside the sphere of influence of the current of air.

4. In a grinding mill, a first crusher chamber, crushing means including a rotative breaker therein, a conduitleading from the crusher chamber, a second crusher chamber, crushing devices including a runner burr therein, a passageway through which the conduit has communication with the second crusher chamber, a rotative conveyer in the passageway, a shaft arranged substantially parallel with the conveyer and having one of its ends extending into the second crusher chamber and carrying the runner burr, a

chamber at the opposite end of the shaft,

a fan mounted on said shaft in said chamber, a

a conduit connecting the fan chamber with the first-mentioned chamber, means for driving the shaft and gearing connecting the shaft with the conveyer and the breaker.

5. A grinding mill having primary andsecondary crushing means adapted, selectively, for initial and consecutive action upon the grain and accessible respectively through independent feed chambers, and a conveyor for conducting the product of the primary crushing means, unaffected by gravit to the feed ,chamberof the secondary crushing means from which it is fed to said secondary crushing means.

, 6. A grinding mill having primary and secondary crushing means, adapted, selec tively, for 'initialan'd consecutive action upon the grain, an independently acting feeder disposed in operatlve relation with the secondary crushing means and a force.

feed conveyor for conducting the product of the primary crushing means to the secondary crushing means and to the a feeder therefor in which excess crushed material may be temporarily stored.

7. A grinding mill having primary and secondary crushing means adapted, selectively, for initial and consecutive action upon the .grain, a gravitally-acting feeder disposed in juxtaposition to the secondary crushing means for feeding material directly to said secondary crushing means, and a force feed conveyor for conducting the product of the primary'crushing means into the path of communication between said feeder and the secondary crushing means.

8. A grinding mill having primary and secondary crushing means adapted, selectively, for initial and consecutive action upon the grain, a gravitally acting feeder disposed in operative relation with the secondary crushing means fordirectly feeding materlal thereto or to constitute an expansion or (iver-flow chamber therefor, and a force feed conveyor for conducting the prodnot of the primary crushing means to secondary crushing means and to the expansion or over-flow chamber.

9. In a grinding mill, the combination of breaking means, a grinding means, a conveyer for conducting the broken am from the breaking means to the grindingv means, and means forming a chamber which is open to the conveyer and receives therefrom grain fed in excess of the capacity of the grinding means, to thereby avoid choking of the latter, said chamber being disposed above the conveyer so as to return the grain thereto gravitally when the quantity being fed thereby is less than the capacity of the grinding means.

10. In a grinding mill, the combination of a first and a second crushing-means, eachof a nature to act initially upon berries or like grain in loose condition and one being of a nature to act successively to the other, means for conveying the grain from one to the other, a feeder connected to the first crushing means, and a separate feeder for the second crushing means, the latter feeder being correlated with the conveyer and second crushing means to act as an overflow I chamber connected with the conveyer and to supply grains to the second crushing means which are not to be subjected to the action of the first crushing means.

11. In a grinding mill, the combination of a first and a second crushing means,

.means for conveying the grain from one to the other, including a passageway and a conveyer in the passageway, a feeder for the first crushing means, and a separate feeder for the second crushing means, the

latter feeder being mounted above and ingravitally when the supply is below the 80 capacity ofsaidcrushing means, and also to supply to the second crushing means grains which are not to be subjected to the action of the first crushing means.

12. In arinding mill, the combination of a first and a second crushing means, each of a nature to act initially upon berries or like grain in loose condition and one being of a nature to act successively to the other,

a conduit connected with the first crushing means, a passageway leading from the conduit to the second crushing means, a conveyer in the passageway, a feeder connected to the first crushing means, means for creating a current of air in the conduit to separate the impurities from the grains therein, and a separate feeder mounted above and in open communication with the discharge end of the passageway and open at the top to permit the feeding of material directly thereinto, for the purposes specified.

13. In a grinding mill, the combination of means forming a breaker chamber, a conduit leading therefrom, a feeder chamber chamber being arranged to receive broken and purified grains fed by the conveyer in excess of the capacity of the grinding means and to return the same to the conveyer when the quantity being fed isless than the capacity of the grinding means, and also to supply to the grinder chamber grains which. n

are to be purified. v

14, A grinding mill" having a crushing means vand a conduit through which the grain moves by gravity, and which is provided with baflies for causing the grain to follow a zig-zag course, and means for roducing currents of air through the con uit,

ground without being broken and one of said currents moving counter to the column of grain and another intersecting the first named current.

15. A grinding mill having a crushing means and a conduit through which the grain'moves by gravity and which is provided with bafiles for causing' the grain to follow a zig-zag course, and means for causing currents of air to traverse the conduit respectively in counter and intersecting relation with the path of the grain therethrough.

16. A grinding mill having a crushing means and a conduit provided with air inlet and outlet openings, means for inducing a current of air through the conduit between said openings, and a grain directing balfie arranged in baffling relation with the current of air between said openings, the conduit having a further inlet for directing, a current of air in intersecting relation with the baffled current.

17. A grinding mill having a crushing means and a conduit provided with air inlet and outlet openings, means for inducing a current of air through the conduit between said openings, and a grain directing bafile arranged in bafiling relation with the current of air between the openings, the conduit having a further inlet for directing a second current of air in convergent relation with a portion of the baflled grain.

18. A inding mill having crushing means an a conduit provided with air inlet and outlet openings, means for inducing convergent currents of air through the con duit toward said outlet opening, and a grain directing bafiie arranged in battling relation with one of said currents of air.

19. A grinding mill having crushing imeans and a conduit provided with an air outlet and a plurality of air inlets, means for inducing convergent currents of air through the conduit from said inlets toward the outlet, a grain directing baflle arranged in bafiling relation with one of said currents of air, and means for proportionately varying the capacities of the inlet openings.

20. A. grinding mill having crushing means and a conduit provided with an air outlet and a plurality of air inlets, means for inducing convergent currents of air through the conduit from said inlets toward the outlet, a grain directing bafile arranged in balfling relation with one of said currents of air, and independent means for relatively yarying the capacities of said air inlet openmgs.

21. In a grinding mill, the combination of crushing means, a conduit leading there-' from, a baflie in the path of grain traversing the conduit, said conduit having an air outlet opening above the plane of the lower edge of the bafile and an air inlet opening rearward of the plane of said lower edge of the baflle, and means for creating a current of air from the inlet opening to the outlet duit, the upper surface of the spout forming a'bafile in the path of grain traversing the conduit, said conduit having an air outlet opening which registers with the opening through the spout and also having an air inlet opening rearward of the plane of the lower end of the spout, and means for creating a current of air within the conduit, from the inlet opening and through the spout and outlet opening.

23. In a grinding mill the combination-of crushing means, a conduit leading therefrom and having an air outlet opening, a spout communicating with said opening and extending inclinatorily partway across the conduitand into the path of grain traversing the conduit, means for creating a current of air in the conduit and spout, and a baflie in the conduit, the end of said spout being directed toward and lying in juxtaposition to the face of said battle and said conduit having an air inlet opening so arranged that air moving from the air inlet opening to the air outlet opening is caused to flow across the body of grain falling from the discharge end of said baffle and into said spout along the face of the body of falling grain.

24. In a grinding mill, crushing means, a conduit leading therefrom, a spout extending inclinatorily partway across the conduit, the upper surfac of the spout forming a baflle in the path of grain traversing the conduit and the conduit havin an outlet opening which registers wit the opening through the spout, a baflle below the spout and spaced from the lower end thereof, the conduit also having an air inlet opening, and means for creating a current of air within the conduit, from the inlet opening and through the spout and outlet opening.

25. In a grinding mill, crushing means, a conduit leading therefrom, a spout extending inclinatorily partway across the conduit, the upper surface of the spout forming a baffle in the path of grain traversing the conduit and the conduit having an outlet opening which registers with the opening through the spout, a bafile below the spout arranged in 21g zag relation therewith, and spaced from the lower end thereof, the conduit also having'an air inlet opening arranged rearward of the vertical plane of the lower end of the spout and presented toward the upper face of the lower baflle, and means for creating a current of air within the conduit, from the inlet opening and through the spout and outlet 0 ning.

26. In a grinding mill, crushing means, a conduit leading therefrom, a spout extending inclinatorily partway across the conduit, the'upper surface of the spout forming a baflle in the path of the grain traversing the conduit and the conduit having an outlet opening which registers with the open ing through the spout, a second baffle disposed in zig zag relation withthe spout and receiving the grain therefrom, said conduit havinga plurality of air inlet openings respectively arranged on opposite sides of the second baffie, and means for creating a current of air from the inlet openings, within the conduit and through the spout and outlet openings. 4

27. In a grmding mill, crushing m'eans,a conduit leading therefrom, a spout extending inclinatorily partway across the conduit, the upper surface of the spout forming a bafile in the path of the grain traversing the conduit and the conduit having an outlet opening which registers with theopening through the spout, a second baflie disposed in zig zag relation with the spout and receiving the rain therefrom, a third bafile, inclined oppositely to the second baflle and receiving the grain therefrom, the conduit also having a plurality of air inlet openings, one of which is arranged rearward of the space between the second and third baflles and the other in advance of said space, and means for creating a current of air from the inlet openings,'within the conduit and through the spout and outlet openings.

28. In a'grinding mill, the combination of crushing means, a conduit leading there from, a baffle in the path of grain traversing the conduit, said conduit having an air outlet opening located above the plane of the lower edge of the fbaflle, an air inlet opening located rearward of the vertical plane intersecting the lower edge of the baf- .fle, an air inlet opening between the lower 'end of the baflle and the air outlet opening, and means for creating a current .of

air from the inlet openings to the outlet opening.

29. In a grinding mill, the combination of crushing 'means, a conduit leading therefrom, a baffle in the path of ain traversing the conduit, said conduit aving an air outlet opening located above the plane of the lower edge of the bafile, an air inlet opening located rearward of the vertical plane inter current of air from the inlet openings to the outlet opening.

31. In a grinding mill, the combination I of means forming a plurality of chambers, and means for conducting the grain from one chamber to the other and purifying it in its passage'between the chambers, including a conduit,-a series of baflles arranged in a zig zag, relation in the path of the grain traversing. the conduit and discharging the grain from one to the other, the conduit having an air outlet opening adjacent the undersurface of the uppermost baflle and also havinga plurality of air inlet openings below the outlet opening and on opposite sides of the intermediate baflie of the series,

and means for creating a current of air from the inlet openings to the outlet opening.

32. In a grinding mill, the combination of means forming a plurality of chambers,

:and means for conducting the grain from one chamber tothe other and purifying it in its passage between the chambers, including a conduit, a'series of baffles arranged 1n 'a zig zag relation in the path ofthe grain traversing the conduit and discharging the grain from one to the other, the conduit having an air outlet opening adjacent the undersurface of the uppermost baflles and also having a plurality of air inlet openings below the outlet opening and on opposite sides of the intermediate baflie. of the series, means for-independently regulating the air inlet openings and means for creating'a current of air from the inlet openings to .the outlet opening. V

33. In a grinding mill, the combination of means fogming a plurality of chambers, and means for conducting the grain from one chamber to the other and purifying it in lts passage between the chambers, including a conduit, having an air outlet opening and an air inlet opening, a spout extending from the outlet opening inclinatorily partway across theconduit, in the path of the grain traversing the conduit, the upper surface of the conduit forming a baffle for the grain and the lower sur ce thereof forming a baflle in the path of the air flowing from the inlet to the outlet, at second bafile, inclined oppositely to the spout and recelvin the grain therefrom, a third bafiie 1nc l1n oppositely to the second baflle and receiv ng the grain therefrom, the condmt also havmg an air inlet so disposed that air flows through, the-space between the second and third conduit, and means for creatm a current of air from the air inlets, wit inthe conduit'and through the spout and outlet. 34. In a grinding mill, a plurality of crushing means, andmeans for conducting the grain from one to the other and purifying it in its passage, comprising a conduit extending from the first crushing means, a conveyer between the conduit and the second crushing means, a plurality of baflles arranged in a zig zag relation within the conduit, in the path of the grain traveling from the first crushing means to the conveyer, said conduit having an air inlet opening and an air outlet opening, and means connected to one of the openings for creating a current of air inthe conduit.

35. In a grinding mill, a plurality of crushing means, and means for conducting the grain from one to the other and purifying it in its passage, comprising a conduit extending from the first crushing means, a conveyer between the conduit and the second crushing means, a series of baflies arranged in a zig zag relation within the conduit, in

I the path of the grain traveling from the first crushing means to the conveyer, said conduit having a plurality of independently regulatable air inlet openings respectively disposed on opposite sides of the intermediate baflie of the series of battles, the conduit also having an air outlet opening, and means connected to one of the openings for creating a current of air in the conduit.

36. In' a grinding mill, crushing means, a conduit extending therefrom, an air conduit having a laterally enlarged head with a prolonged inlet openin therein presented toward the first mentioned conduit, the first named conduit having an outlet opening which is of substantially the same dimensions as the inlet opening in the head of the second conduit and "registers therewith, and means for creating a current of air within ihe ((ilonduits and through said openings and 37. In a grinding mill, crushing means, a conduit extending therefrom, a bafiie interposed in the path of the grain traversing the conduit, means forming. a spout in advance vof the baflie, an air conduit having a laterally enlarged head with a prolonged opening therein, the first-mentioned conduit having an air outlet opening whose dimensionsare substantially co-extensive with the dimensions of the opening in the head of the second conduit','said openlngs registering with each other, and means for creating a current of air within the conduits, head and spout.

38. In a grinding mill, crushing means, a conduit extending therefrom and having an air inlet opening and an air outlet opening,

a spout extending from the air outlet opening inclinatorily partway across the conduit and in the path of the grain belng discharged from the crushing means, a baflie inclined oppositely to the spout and receiving the grain from an external surface of the latter, an air conduit, having a laterally enlarged head with a prolonged inlet opening which registers with the outlet opening in the first-mentioned conduit, the dimensions of the latter opening being substantially the same as the inlet opening to the head, and means for creating a current of air within the conduits and through the spout and head.

39. In a grain grinding mill, the combination of a crushing means and a grinding mea-ns of'a nature to act successively upon berries or like grain in loose condition, means for conducting. crushed grain from the crushing to the grinding means comprising a substantially vertical passageway, a horlzontal passageway at the bottom thereof, a conveyor in said passageway, an outlet in the bottom of the passageway; out of alignment with the vertical passageway and above the grinding means, and a feed hopper above the conveyor and in align visions adapted to permit the direct introduction of uncracked coffee to the pulverizing means whereby coffee may be directly pulverized without previous cracking and without removal of chafi-like material.

41. A combined cofi'ee cracking and pulverizing machine comprising in comblnation, means for cracking the coffee, means for pulverizing the cracked coffee, means for conveying the cracked coffee to the pulverizing means, a supplemental storage chamber receiving excess cracked material delivered by the conveying means during the relatively slower pulverizing operations, said chamber being arranged to efiect subsequent automatic delivery of the excess material stored therein to the pulverizing means when the latter has pulverized the material delivered directly thereto by the conveying means, and means disposed intermediate the cracking and pulverizing means for removing chaff from said cracked cofl'ee prior to the pulverizing operation.

In testimony w BERNARD M. ELY.

ereof I afiix my signature. 

